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Questions in chemistry

📝 Answered - The molar mass of an element is equal to: A. the mass of an atom of the element in grams. B. the atomic mass of the element in grams. C. the number of atoms in a mole of the element. D. the number of atoms in a gram of the element. E. the number of electrons in an atom in grams.

📝 Answered - What holds calcium chloride together? A. Hydrogen bonding B. Metallic bonding C. Ionic bonding D. Dipole forces E. Van der Waals forces (London dispersion forces)

📝 Answered - Which substance does not obey the Lewis octet rule? (a) N₂ (b) NO (c) CF₄ (d) Ar

📝 Answered - Aqueous solutions of which ion give a reddish precipitate when excess hydroxide ion is added? A. [tex] \text{Cu}^{2+} [/tex] B. [tex] \text{CO}_3^{2−} [/tex] C. [tex] \text{Fe}^{3+} [/tex] D. [tex] \text{Al}^{3+} [/tex] E. [tex] \text{Pb}^{2+} [/tex]

📝 Answered - Which substance does not obey the Lewis octet rule? a. O₂ b. NO c. CO d. N₂

📝 Answered - Why are water storage tanks usually built on towers or hilltops?

📝 Answered - Which is a proper description of chemical equilibrium? A. The frequencies of reactant and product collisions are identical. B. The concentrations of products and reactants are identical. C. The velocities of product and reactant molecules are identical. D. Reactant molecules are forming products as fast as product molecules are reacting to form reactants. E. The numbers of moles of reactants and products are equal.

📝 Answered - Solid sulfur dioxide, SO₂(s) Choose from the following: A. an ionic solid B. a metallic solid C. a molecular solid containing nonpolar molecules D. a covalent network solid E. a molecular solid containing polar molecules

📝 Answered - Na\(_2\)SO\(_4\) (aq) + AgNO\(_3\) (aq) yields what when balanced?

📝 Answered - Which instrument is directly used to determine the relative masses of atoms? A. Spectroscope B. Geiger counter C. Mass spectrograph D. Microbalance E. Electron microscope